Open roberto-arista opened 2 years ago
It's the OS doing it:
from AppKit import NSFont
f = NSFont.fontWithName_size_("Helvetica", 0)
print(f)
Prints:
"Helvetica 12.00 pt. P [] (0x10faa7300) fobj=0x1002696f0, spc=3.33"
see https://developer.apple.com/documentation/appkit/nsfont/1525977-fontwithname
If you use a fontSize of 0.0, this method uses the default User Font size.
The fact that NSFont.fontWithName_Size_
behaves like this should no necessarily mean DrawBot should also behave like this. I don't like that this AppKit oddity trickles back into the DrawBot API, and I will for example not duplicate this behavior in drawbot-skia.
I tried for fun: NSFont.fontWithName_matrix_()
can be passed a (0, 0, 0, 0, 0, 0)
matrix, and it won't magically use 12 pt. So we could fix it. Although it's such an edge case that I'm inclined to just leave it as it is.
I agree that it is an oddity, and definitely an edge case.
this is funny:
import AppKit
s = 0 # change to a other number and it returns the same cached font object
f1= AppKit.NSFont.fontWithName_matrix_("Helvetica", (s, 0, 0, s, 0, 0))
print(f1)
print(f1.pointSize())
f2 = AppKit.NSFont.fontWithName_size_("Helvetica", s)
print(f2)
print(f2.pointSize())
print(f1 == f2)
Yeah, there's clearly a special case for (0, 0, 0, 0, 0, 0)
.
I guess there must be a postscript limitation or assumption
import AppKit
t = FormattedString()
s = 0
f1= AppKit.NSFont.fontWithName_matrix_("Helvetica", (s, 0, 0, s, 0, 0))
attr1 = AppKit.NSAttributedString.alloc().initWithString_attributes_("foo", {AppKit.NSFontAttributeName: f1, AppKit.NSForegroundColorAttributeName: AppKit.NSColor.blackColor()})
t.getNSObject().appendAttributedString_(attr1)
f2 = AppKit.NSFont.fontWithName_size_("Helvetica", s)
attr2 = AppKit.NSAttributedString.alloc().initWithString_attributes_("foo", {AppKit.NSFontAttributeName: f2, AppKit.NSForegroundColorAttributeName: AppKit.NSColor.blackColor()})
t.getNSObject().appendAttributedString_(attr2)
print(t)
text(t, (100, 100))
saveImage('zeroPointSize.pdf')
this renders wrongly in Acrobat, Illustrator and Preview...
hey all!
I am not sure if this is a bug or not, but I just discovered that this snippet:
does not leave the canvas blank. DrawBot draws "hello" with the default font size. Does this happen with intention or because zero is falsy?
Of course I can always wrap the code in an if statement and skip the
text()
function, butfontSize = 0
seems a logic – but maybe unorthodox – way to not draw some text on the canvas.